Material of valves for primary chlor-alkali brine solution

In cases where the saltwater contains particles, it is recommended to use wear-resistant ceramic-lined butterfly valves or those made of cemented carbide materials, as these materials offer better wear and corrosion resistance. .

As provided by Deepseek, in the chlor-alkali industry, the material selection for one-time use brine valves is of critical importance; such valves must possess properties such as corrosion resistance, high-temperature resistance, and pressure resistance. Common materials include titanium and titanium alloys. Advantages: strong corrosion resistance, making them particularly suitable for chlor-alkali environments. Applications: Widely used in valves for highly corrosive media. Nickel and nickel alloys: Advantages include corrosion resistance and high-temperature performance, making them suitable for highly corrosive environments. Applications: Commonly used in high-demand chlor-alkali processes. Advantages of Hastelloy: excellent corrosion resistance and high-temperature performance. Applications: Suitable for extreme corrosive environments. Polytetrafluoroethylene (PTFE) Advantages: It has excellent corrosion resistance and is often used as a lining or sealing material. Applications: Suitable for medium-low temperature and medium-pressure environments. Stainless steel (such as 316L): Advantages: good corrosion resistance, cost-effective and practical. Applications: Suitable for general corrosive environments. Advantages of duplex stainless steel: it combines strength and corrosion resistance. Applications: Suitable for highly corrosive and high-stress environments. Lined valves (such as those with rubber or plastic lining) have the advantages of being corrosion-resistant and having lower costs. Applications: Suitable for medium-low temperature and medium-pressure environments. Selection criteria: Medium properties, such as chloride ion concentration, pH value, etc. Operating conditions: temperature, pressure, etc. Economics: Consider both cost and performance. Conclusion Titanium, nickel alloys, and Hastelloy are common materials for valves used in chlor-alkali primary brine systems; the specific choice depends on process conditions and economic factors.

The materials I’ve come across are either fluorocarbon-lined or rubber-lined; perhaps people think that since the price is low, it’s fine to replace them when they break. Special materials are definitely wear-resistant, but they’re too expensive; it depends on whether your company is willing to spend more money on them

Yes! It seems to make quite some sense what was said

You need to provide the concentration of the saltwater each time, as well as the particle content and hardness; only then can an appropriate selection be made. As you can see with AI, without specific data, it lists everything out.

The saltwater concentration is 300–320. The particle content and hardness have not been measured, as the presence of particles is allowed due to the operating conditions of the process. It’s just that our instruments keep breaking down: L

Does it happen more in winter and less in summer? At this normal concentration, no precipitation should occur, but the fact that crystallization still takes place indicates that the insulation measures in place are inadequate. The damage to the control valves is closely related to the presence of crystalline particles; a temporary solution is to replace them with food-grade, mirror-polished valves, which can effectively prevent the medium from adhering and forming crystals. Another important point is to ensure proper insulation of the pipes; under normal conditions, no crystals will form when the temperature is above 20°C.